'Patriarch' fuses Greek 'pater' (father) + 'arkhein' (to rule) — family authority as political power.
The male head of a family or tribe; a biblical figure regarded as a father of the human race (especially Abraham, Isaac, and Jacob); a high-ranking bishop in certain Christian churches.
From Old French 'patriarche,' from Late Latin 'patriarcha,' from Greek 'patriárkhēs' (father-ruler, chief of a race, leader of a tribe), a compound of 'patriá' (family, lineage, clan, derived from 'patḗr,' father) + 'árkhein' (to rule, to be first, to begin), from Proto-Indo-European *ph₂tḗr (father) + *h₂erḱ- (to hold, contain, guard). Originally applied to the biblical founding fathers — Abraham, Isaac, Jacob — and then to the supreme bishops of major sees in early Christianity (Rome, Constantinople, Alexandria, Antioch, Jerusalem). PIE *ph₂tḗr (father) yields Sanskrit
The Ecumenical Patriarch of Constantinople (modern Istanbul) holds the title 'first among equals' in Eastern Orthodox Christianity — a spiritual primacy without the governmental power of the Pope. The title has been held continuously since the 4th century, making it one of the oldest surviving institutional titles in the world.